vm_page_protect man page on PC-BSD

vm_page_protect man page on PC-BSD

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VM_PAGE_PROTECT(9)	 BSD Kernel Developer's Manual	    VM_PAGE_PROTECT(9)

NAME
     vm_page_protect — lower a page's protection

SYNOPSIS
     #include <sys/param.h>
     #include <vm/vm.h>
     #include <vm/vm_page.h>

     void
     vm_page_protect(vm_page_t mem, int prot);

DESCRIPTION
     The vm_page_protect() function lowers a page's protection.	 The protec‐
     tion is never raised by this function; therefore, if the page is already
     at VM_PROT_NONE, the function does nothing.

     Its arguments are:

     mem   The page whose protection is lowered.

     prot  The protection the page should be reduced to.  If VM_PROT_NONE is
	   specified, then the PG_WRITABLE and PG_MAPPED flags are cleared and
	   the pmap_page's protection is set to VM_PROT_NONE.  If VM_PROT_READ
	   is specified, then the PG_WRITABLE flag is cleared and the
	   pmap_page's protection is set to VM_PROT_READ.

     Higher protection requests are ignored.

AUTHORS
     This manual page was written by Chad David ⟨davidc@acns.ab.ca⟩.

BSD				 July 14, 2001				   BSD

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